Gives chemistry breathing room - moves welding tank to a wall-mount version

code/modules/reagents/reagent_dispenser.dm

@@ -92,6 +92,7 @@
 	icon_state = "weldtank"
 	amount_per_transfer_from_this = 10
 	var/obj/item/device/assembly_holder/rig = null
+	var/accepts_rig = 1
 
 /obj/structure/reagent_dispensers/fueltank/New()
 	..()
@@ -126,7 +127,7 @@
 			overlays = new/list()
 
 /obj/structure/reagent_dispensers/fueltank/attackby(obj/item/weapon/W as obj, mob/user as mob, params)
-	if (istype(W,/obj/item/device/assembly_holder))
+	if (istype(W,/obj/item/device/assembly_holder) && accepts_rig)
 		if (rig)
 			user << "\red There is another device in the way."
 			return ..()
@@ -254,3 +255,9 @@
 /obj/structure/reagent_dispensers/spacecleanertank/New()
 	..()
 	reagents.add_reagent("cleaner",5000)
+
+/obj/structure/reagent_dispensers/fueltank/chem
+	icon_state = "weldingtank_chem"
+	anchored = 1
+	density = 0
+	accepts_rig = 0

code/modules/surgery/helpers.dm

@@ -0,0 +1,94 @@
+/proc/attempt_initiate_surgery(obj/item/I, mob/living/M, mob/user, var/override )
+	if(istype(M))
+		var/mob/living/carbon/human/H
+		var/obj/item/organ/external/affecting
+		var/selected_zone = user.zone_sel.selecting
+
+		if(istype(M, /mob/living/carbon/human))
+			H = M
+			affecting = H.get_organ(check_zone(selected_zone))
+
+		if(isslime(M) ||isalien(M) ||can_operate(H))	//if they're prone or a slime
+			var/datum/surgery/current_surgery
+
+			for(var/datum/surgery/S in M.surgeries)
+				if(S.location == selected_zone)
+					current_surgery = S
+
+			if(!current_surgery)
+				var/list/all_surgeries = surgeries_list.Copy()
+				var/list/available_surgeries = list()
+
+				for(var/datum/surgery/S in all_surgeries)
+					if(!S.possible_locs.Find(selected_zone))
+						continue
+					if(affecting && S.requires_organic_bodypart && affecting.status == ORGAN_ROBOT)
+						continue
+					if(!S.can_start(user, M))
+						continue
+
+					for(var/path in S.allowed_mob)
+						if(istype(M, path))
+							available_surgeries[S.name] = S
+							break
+
+				if(override)
+					if(istype(I,/obj/item/robot_parts))
+						var/datum/surgery/S = available_surgeries["robotic limb attachment"]
+						if(S)
+							var/datum/surgery/procedure = new S.type
+							if(procedure)
+								procedure.location = selected_zone
+								M.surgeries += procedure
+								procedure.organ_ref = affecting
+								procedure.next_step(user, M)
+
+				else
+					var/P = input("Begin which procedure?", "Surgery", null, null) as null|anything in available_surgeries
+					if(P && user && user.Adjacent(M) && (I in user))
+						var/datum/surgery/S = available_surgeries[P]
+						var/datum/surgery/procedure = new S.type
+						if(procedure)
+							procedure.location = selected_zone
+							M.surgeries += procedure
+							procedure.organ_ref = affecting
+							user.visible_message("[user] prepares to operate on [M]'s [parse_zone(selected_zone)].", \
+							"<span class='notice'>You prepare to operate on [M]'s [parse_zone(selected_zone)].</span>")
+
+			else if(!current_surgery.step_in_progress)
+				if(current_surgery.status == 1 )
+					M.surgeries -= current_surgery
+					user << "You stop the surgery."
+					qdel(current_surgery)
+				else if(istype(user.get_inactive_hand(), /obj/item/weapon/cautery) && current_surgery.can_cancel)
+					M.surgeries -= current_surgery
+					user.visible_message("[user] mends the incision on [M]'s [parse_zone(selected_zone)] with the [I] .", \
+						"<span class='notice'>You mend the incision on [M]'s [parse_zone(selected_zone)].</span>")
+					affecting.open = 0
+					affecting.germ_level = 0
+					affecting.status &= ~ORGAN_BLEEDING
+					qdel(current_surgery)
+				else if(current_surgery.can_cancel)
+					user << "<span class='warning'>You need to hold a cautery in inactive hand to stop [M]'s surgery!</span>"
+
+
+			return 1
+	return 0
+
+
+
+proc/get_location_modifier(mob/M)
+	var/turf/T = get_turf(M)
+	if(locate(/obj/machinery/optable, T))
+		return 1
+	else if(locate(/obj/structure/table, T))
+		return 0.8
+	else if(locate(/obj/structure/stool/bed, T))
+		return 0.7
+	else
+		return 0.5
+
+
+//just until i update maps....
+/obj/item/organ/brain/New()
+	new /obj/item/organ/internal/brain(src.loc)